Troubleshooting portal outage with "connection_refused" in httperr

We recently had a portal outage where rebooting the servers was necessary to resolve the issue. HTTPERR logs displayed this:
2008-12-29 22:40:47 - - - - - - - - - 1_Connections_Refused -
2008-12-29 22:40:52 - - - - - - - - - 1_Connections_Refused -
2008-12-29 22:40:57 - - - - - - - - - 1_Connections_Refused -
2008-12-29 22:41:02 - - - - - - - - - 1_Connections_Refused -
2008-12-29 22:41:07 - - - - - - - - - 1_Connections_Refused -
2008-12-29 22:41:12 - - - - - - - - - 1_Connections_Refused -
After some googling, it looks like this error indicates that system memory is low. I noticed that after the reboot, the "Free System Page Table Entries" in perfmon was around 8000. I removed the /3GB startup switch that some wacky consultant recommend that we implement long long ago and now that value is above 180,000. I don't know if any of this is related or if I just set myself up for certain doom in the future.
Do you use the /3GB switch on your windows portal servers?
Have you ever seen this error in HTTPERR.log?
many thanks!

Wacky only if recommended for an earlier version of Windows than the version in which it became a product prerequisite.
I have found (through monitoring) that when the ASP.Net worker process gets large, the portal has already become unresponsive. I could not see the process becoming as large the /3GB switch would allow, unless the application pool had some bloatware running alongside the portal, causing the worker process itself to bloat until recycled automatically though the framework, or manually (IISRESET).
The /3GB switch is only useful on Search Server, IMHO. I do not know why it is a requirement anywhere else; but I have had server teams baulk at setting /3GB, saying that it isn't supported by Microsoft. Go figure.

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Troubleshooting portal outage with "connection_refused" in httperr

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